JP2011117963A - Emergency pneumatic fluid source for harsh environment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alternate source of the pneumatic fluid to a system inside containment of a nuclear power plant. <P>SOLUTION: An embodiment may provide a nearly radiation-proof and nearly leak-proof pneumatic fluid supply installation for some systems of the nuclear power plant. These systems may include, but is not limited to, actuators, valves, and the like. The embodiment may include a device that may propel an object with a sufficient force to puncture a seal of a pressure vessel. The released pneumatic fluid may be ported to an actuator, valve, or the like, for immediate operation of a system of the nuclear power plant. Alternately, the pneumatic fluid may be used to resupply a depleted accumulator, or the like. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates generally to an air supply system for nuclear power plants, and more particularly to a system for supplying air to an air-operated device used in a nuclear plant in an emergency.

  FIG. 1 is a schematic diagram illustrating an environment in which an embodiment of the present invention operates. Specifically, FIG. 1 shows a known air supply system for operating an air-operated valve 75 disposed inside a containment building 130 of the nuclear power plant 10 (hereinafter referred to as “container inside”). A limited example is shown. As shown in FIG. 1, the air fluid for operating the air operating valve 75 can be supplied from, for example, the pressurized tank 15 storing nitrogen or the air compressor 20 without being limited thereto. In general, the operating pressure of the air fluid is controlled by the pressure regulator 25. The valve 30 adjacent to the containment wall 133 can be manually closed to prevent a drop in air pressure within the system when the pressurized tank 15 or the air compressor 20 is not available.

  The air system piping passes through the penetration of the containment wall 133. The check valve 35 generally serves to reduce the chance of potentially radioactive gas escaping from the containment interior 130 through the containment wall 133. The downstream air pipe 45 is a relatively long pipe and may be damaged by an accident in the inner side 130 of the containment vessel. The flow restricting orifice 40 serves to restrict the flow rate of the air fluid inside the containment vessel 130 when the pipe 45 is broken downstream of the orifice 40. The check valve 50 is provided immediately upstream of the pressure accumulator 55 and serves to prevent a pressure drop from the pressure accumulator 55 when the long pipe 45 is broken.

  The accumulator 55 is generally dimensioned to ensure a sufficient supply of air fluid to operate the valve 75. In order to withstand the loss of air fluid due to leakage through the check valve 50, the relief valve 60, or the solenoid valve 65 in the event of a failure of the air system, the accumulator 55 is larger than necessary to operate the valve 75. Is also quite large. The relief valve 60 generally serves to protect the system from overpressure due to the pressure regulator 25 not sufficiently controlling the pressure or from overpressure due to higher temperatures near the accumulator 55.

  When the solenoid valve 65 is opened during operation, air fluid is sent to the air actuator 70 to drive the valve 75. The air actuator 70 may be of any type including but not limited to a diaphragm, bellows, piston, and the like. The valve 75 may be of any type including but not limited to gate valves, globe valves, ball valves, air dampers, and the like. The valve 75 can be designed to open or close after an accident in the nuclear power plant 10.

  Several problems can arise with currently known air supply systems. Current systems require a large number of piping and isolation devices. Installation, maintenance, and operation of these systems generally require a pressure accumulator, containment penetration, and multiple valve configurations to protect against leakage between the containment inner 130 and containment outer 135 areas. is there. These systems also require long installation and maintenance times, which can cause operators to be exposed to long-term radiation.

US Pat. No. 5,149,290

  Based on the above considerations, an operator of nuclear power plant 10 may desire a system that provides an emergency air supply to components such as, but not limited to, a valve 75 in the area of containment interior 130. . This system can be placed inside the containment 130 and should be remotely operable. This system should require fewer components than known systems.

  According to one embodiment of the present invention, an apparatus for supplying an air fluid to a system in a containment area of a nuclear power plant is a system that receives the air fluid and places it in a containment area of a nuclear power plant. A body mechanism configured to send toward a component device, the body mechanism configured to receive air fluid from a supply source, an exhaust port configured to cause air fluid to flow out of the body mechanism; A supply port with a seal adapted to substantially prevent the fluid from flowing toward the discharge port, configured to position the instrument, whereby the instrument is slidable through the portion of the guide tube A guide tube that moves to engage the seal, an operation chamber configured to direct air fluid from the supply port to the discharge port, and move the instrument. Comprising a that drive, body mechanism and the drive device is arranged in the containment zone of a nuclear power plant, integrally operate as a pneumatic fluid supply source to at least one system of the nuclear power plant.

  According to another embodiment of the present invention, an emergency fluid supply system operable in a containment area of a nuclear power plant includes a containment area in which a boiling water reactor is operated, and a nuclear power plant. An emergency fluid comprising: a recirculation system comprising an air actuated valve that accepts air supply from a primary fluid supply; and an emergency air supply system configured to provide additional air supply when required. The system includes a body mechanism disposed in the containment area and configured to receive an air fluid and route it toward components of the system disposed in the containment area of the nuclear power plant, A discharge port configured to cause the air fluid to flow out of the body mechanism, configured to receive the air fluid from a source, and the air fluid flows toward the discharge port A supply port with a seal adapted to substantially prevent the device from being configured to position the instrument, whereby the instrument is slidably moved through the portion of the guide tube to engage the seal A guide tube, an operation chamber configured to direct air fluid from the supply port to the discharge port, and a drive for moving the instrument.

1 is a schematic diagram illustrating an environment in which an embodiment of the present invention operates. FIG. 1 is an exploded isometric schematic showing an emergency air supply system according to one embodiment of the present invention. FIG. FIG. 3 is a schematic elevation view showing a partial cross-section of the emergency air supply system of FIG. 2 according to one embodiment of the present invention. FIG. 3 is a schematic elevation view showing a partial cross-section of the emergency air supply system of FIG. 2 according to one embodiment of the present invention. FIG. 2 is a schematic elevational view showing a partial cross section of the emergency air supply system of FIG. 1 integrated with a first nuclear power plant system according to an embodiment of the present invention. It is the schematic which shows one Embodiment of the emergency air supply system in the environment shown in FIG. FIG. 2 is a schematic plan view illustrating the emergency air supply system of FIG. 1 integrated with a second nuclear power plant system according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view illustrating the emergency air supply system of FIG. 1 integrated with a second nuclear power plant system according to an embodiment of the present invention. FIG. 2 is a schematic plan view illustrating the emergency air supply system of FIG. 1 integrated with a second nuclear power plant system according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view illustrating the emergency air supply system of FIG. 1 integrated with a second nuclear power plant system according to an embodiment of the present invention. FIG. 2 is a schematic diagram illustrating an alternative embodiment of an emergency air supply system within the environment illustrated in FIG. 1.

  Certain terminology is used herein for the convenience of the reader only and is not to be understood as limiting the scope of the invention. For example, “Up”, “Down”, “Left”, “Front”, “Right”, “Horizontal”, “Vertical”, “Upstream”, “Downstream”, “Front”, “Rear”, etc. The term is merely used to describe the configuration shown in the figure. Indeed, the components of embodiments of the present invention can be oriented in any direction, and thus the term should be understood to include such modifications unless otherwise specified.

  It should be understood that as used herein, an element or step described in the singular or without a number does not exclude a plurality of elements or steps unless explicitly stated. Furthermore, references to “one embodiment” of the present invention are not intended to exclude additional embodiments including the described features.

  The following discussion will focus on embodiments of the present invention that are integrated with the nuclear power plant 10. Another embodiment of the present invention can be integrated with another system that provides an emergency air supply system for components and / or systems that operate in harsh environments.

  The present invention takes the form of an apparatus or system that can provide an alternative source of air fluid to a system within the containment interior 130 of the nuclear power plant 10. The embodiment of the present invention can provide a substantially radiation-resistant and substantially leak-proof air-fluid supply facility to several systems of the nuclear power plant 10. The system can include, but is not limited to, actuators, valves, and the like.

  Embodiments of the present invention form an emergency or secondary air fluid source when needed. Embodiments of the present invention may include devices that can propel an object with sufficient force to puncture a pressure vessel seal. The released air fluid can be transferred to an actuator, valve, etc. for immediate operation. In an alternative embodiment of the present invention, air fluid can be used to resupply a depressurized accumulator or the like.

  Embodiments of the present invention can form a new and improved emergency air supply system 200. Here, the components of the emergency air supply system 200 can be disposed inside the containment vessel 130. Referring again to the figures, various numbers indicate similar parts throughout the several figures. FIG. 2 is a schematic exploded isometric view illustrating an emergency air supply system 200 according to one embodiment of the present invention. In one embodiment of the present invention, the emergency air supply system 200 includes a body 205, a pressure vessel 220 such as, but not limited to, a hermetically sealed pressure cylinder having a metal seal 222, a solenoid coil 225, a core 230, An assembly having a cap 250, a cap seal 255, and a control system 300 may be included.

  The main body 205 may be considered a mechanism that can be configured to receive air fluid from a supply source, such as, but not limited to, a pressure cylinder 220. As described, the body 205 can then send air fluid from the source to components of the system inside the containment 130 or toward components outside the containment (not shown). One embodiment of the body 205 may comprise an exhaust port 210 configured to receive air fluid from a source and direct the air fluid out of the body 205. One embodiment of the body 205 may comprise a plurality of exhaust ports 210 that can exhaust air fluid from the emergency air supply system 200 to a plurality of components. The body 205 may also include a guide tube 215 configured to position an instrument such as, but not limited to, the core 230. The body 205 may also include an operation chamber 223 shown in FIG. 3 and configured to flow air fluid from the pressure vessel 220 to the at least one exhaust port 210.

  The emergency air supply system 200 implements a hermetically sealed high pressure gas storage container, such as but not limited to the pressure container 220. However, the present invention is not intended to limit the pressure vessel 220 to use only as a source of air fluid. One embodiment of the pressure vessel 220 may take the form of a high pressure gas storage vessel, such as but not limited to a pressurized cylinder. An alternative embodiment of the present invention may include a plurality of pressure cylinders as the pressure vessel 220. Here, these pressurization cylinders can be configured to supply air fluid to the body 205 substantially simultaneously. Alternatively, a plurality of pressure cylinders can be configured to operate individually.

  The pressure vessel 220 can store air fluid used to operate the emergency air supply system 200. The contents of the pressure vessel 220 may include, for example, but not limited to, an ideal gas or a liquefied gas. A pressure vessel 220 that stores an inert ideal gas, such as but not limited to nitrogen or argon, may be preferred for the nuclear power plant 10.

  Solenoid 225 generally serves as a drive device for core 230. However, the present invention is not intended to be limited to using only the solenoid 225 as the drive. Other devices and systems such as, but not limited to, mechanical, electrical, electrical, and electro-pneumatic can be incorporated into the embodiments of the present invention and function as a drive device. One embodiment of solenoid 225 may include a nuclear grade solenoid operable on containment interior 130. An alternative embodiment of solenoid 225 may be rated to operate in a harsh environment where an embodiment of the present invention may be operated.

  One embodiment of the solenoid 225 may include a shape that is simple but can be reliably integrated with the emergency air supply system 200. For example, but not limited thereto, the solenoid 225 may have a cylindrical shape as shown in FIG. 2 and may have an internal hole in which the solenoid 225 can be slidably coupled to the guide tube 215.

  Think of the core 230 as an instrument that moves through the guide tube 215 and punctures the seal 222, thereby allowing air fluid to flow through the operation chamber 223 and out of the body 205 via the exhaust port 210. Good. However, the present invention is not intended to limit the use of core 230 only as an instrument that performs the functions described herein. One embodiment of the core 230 may include a shaft 235, such as, but not limited to, a stem having a penetrator 240 disposed at the end. Penetrator 240 may be formed of a material that can penetrate cap 250 and cap seal 255. One embodiment of the shaft 235 may include a removable penetrator 240 that can be replaced as needed. One embodiment of the core 230 may include a spring 245. The spring 245 may serve to position the core 230 away from the seal 222 during normal operation of the BWR. The spring 245 can also serve to position the core 230 at a distance that can prevent improper actuation of the pressure vessel 220 due to vibration or the like with sufficient force.

  The control system 300 can be configured to remotely control the emergency air supply system 200. The control system 300 may comprise at least one device that can flexibly position the control system 300 and flexibly attach the emergency air supply system 200 within the area of the containment interior 130. One embodiment of the control system 300 can be integrated with a control system that operates nuclear plant components.

  3A and 3B, collectively these FIG. 3 is a schematic elevational view showing a partial cross-section of the emergency air supply system 200 of FIG. 2 according to one embodiment of the present invention. FIG. 3 shows diagrams before and after operation of the emergency air supply system 200. FIG. 3A shows a normal or operable state of the emergency air supply system 200. FIG. 3B shows the emergency air supply system 200 after use. FIG. 3 also shows how the operation chamber 223 allows the core 230 to enter the chamber and pass air fluid from the pressure vessel 220 to the exhaust port 210.

  As shown in FIG. 3A, in the ready state, the emergency air supply system 200 can be configured to operate quickly when needed. The position of the core 230 is determined by the spring 245. Depending on the size and strength of the spring 245, the core 230 is typically held at a distance indicated by “X” 260. The distance X260 may be considered as a space necessary for the penetrator 240 to be held so as not to accidentally puncture the seal 222. The distance X260 may be large enough to prevent malfunction, but small enough to ensure rapid operation of the emergency air supply system 200.

  As shown in FIG. 3B, when the control system 300 energizes the solenoid 225, the core 230 is propelled and the penetrator 240 penetrates the seal 222 of the pressure vessel 220. The pneumatic fluid in the pressure vessel 220 can then be exhausted from the body 205 through the exhaust port 210. Further, the distance X 260 is nearly zero, indicating that the core 230 has completed its movement and has entered the pressure vessel 220 through the operation chamber 223 and has pierced the seal 222.

  In use, the penetrator 240 in one embodiment of the present invention may be attached to a shaft 235, also considered a stem. The shaft may be attached to the core 230. The components of the emergency air supply system 200 described above can be sized and configured such that the penetrator 240 does not engage the seal 222 of the pressure vessel 220 when the core 230 is resting on the cap 250. The spring 245 may be dimensioned to hold the core 230 relatively firmly on the cap 250 under reasonable and customary vibration and impact load conditions. Accordingly, it is possible to prevent the penetrator 240 from penetrating through the seal 222 of the pressure vessel 220 at an early stage. Solenoid 225 and guide tube 215 may be sized, configured and made of a ferromagnetic material. When the coil 225 is energized, a magnetic force is generated over the distance X260. This magnetic force may be strong enough to pull the core 230 out of the cap 250, compress the spring 245, reduce the distance X260, and drive the penetrator 240 into the seal 222 of the pressure vessel 220. By these operations, the pressure stored in the pressure vessel 220 can be released as shown in FIG. 3B. Pressurized air fills the operation chamber 223 of the body 205 and can be exhausted through the exhaust port 210 to reach the connected valve actuator. Cap 250 and optional seal 255 serve to prevent loss of air supply through the end of guide tube 215.

  4-7 illustrate non-limiting examples of applications in which the emergency air supply system 200 can be used. FIG. 4 illustrates one embodiment of an emergency air supply system 200 combined with a pressure accumulator 400. FIG. 5 shows the embodiment of FIG. 4 incorporated into the environment shown in FIG. FIG. 6 illustrates one embodiment of an emergency air supply system 200 in combination with a valve positioner 500. FIG. 7 shows the embodiment of FIG. 6 incorporated in the environment shown in FIG.

  FIG. 4 is a schematic elevational view showing a partial cross section of the emergency air supply system 200 of FIG. 1 integrated with a first nuclear power plant system, according to one embodiment of the present invention. Thus, the first nuclear system can incorporate an accumulator 400 that may be used with standard pneumatic equipment that cannot withstand the maximum pressure in the pressurized cylinder 220. The accumulator 400 can include an accumulator mount 410, an accumulator seal 420, and an exhaust port 430. The accumulator mount 410 can be coupled to the body 205 of the emergency air supply system 200. The accumulator seal 420 can be disposed between the main body 205 and the accumulator mount 410. In use, the air fluid exiting the exhaust port 210 may flow into the pressure accumulator 400 after the control system 300 activates the air supply system 200. In this application, the pressure vessel 220 can be dimensioned to fill the accumulator 400 at a pressure that is effective and acceptable for standard air-operated equipment during operation of the emergency air supply system 200. .

  FIG. 5 is a schematic diagram illustrating an embodiment of an emergency air supply system in the environment illustrated in FIG. In use, this embodiment of the invention may be integrated with an air actuator 70 of the nuclear power plant 10 that is designed to operate using an air pressure of about 100 psi. The air actuator 70 may be of a type that can operate components with air or other compressed gas. Some pressure vessels 220, such as but not limited to pressurized gas cylinders, may be filled to pressures in excess of 1000 psi. This pressure can damage standard air actuators 70 that are not designed for this range of high pressures that can be supplied from pressure vessel 220. The accumulator can be sized sufficiently large to allow the active component to be operated multiple times by separate control systems. This embodiment of the emergency air supply system 200 includes a pressure accumulator 400 that can be attached to the exhaust port 210 of the emergency air supply system 200. In this way, the accumulator 400 can be filled from the exhaust port 210 through the inlet port 420 as air fluid is released from the pressure vessel 220. The air fluid can then exit the pressure accumulator 400 and pass through the exhaust port 430 to actuate the valve 75. Pressure vessel 220 and accumulator 400 can be sized to reduce the air pressure stored in a pressurized cylinder or other pressure vessel 220.

  FIGS. 6A-6D, together with these, FIG. 6 is a schematic plan view and schematic cross-sectional view showing the emergency air supply system of FIG. 1 integrated with a second nuclear power plant according to one embodiment of the present invention. It is. FIG. 6 illustrates how the emergency air supply system 200 can be incorporated into the valve positioner 500 that drives the valve 510. FIG. 6 shows a quarter-turn ball valve as an example of a component that can be operated by the air supply system 200. The air supply system can be used for any component that uses supply air for operation. 6A and 6B, which is a cross-sectional view of FIG. 6A, illustrate how the body 205 of the emergency air supply system 200 and the valve positioner 500 can be integrated. Here, the valve 510 is shown in an open position--that is, the emergency air supply system 200 in an operable state as shown for a normally open valve. Alternatively, the air supply system 200 can be used for a normally closed position valve.

  6C and FIG. 6D, which is a cross-sectional view of FIG. 6C, illustrate how the valve positioner 500 can drive the normally open valve 510 to the closed position. These figures show a state in which the emergency air supply system 200 is operated. The air fluid exiting the exhaust port 210 thus moves the valve positioner 500 and then changes the position of the valve 510.

  FIG. 7 is a schematic diagram illustrating an alternative embodiment of an emergency air supply system within the environment shown in FIG.

  In use, this embodiment of the present invention can be integrated with a valve 75 having an air actuator 70 according to an embodiment of the present invention. FIG. 7 shows an emergency air supply system 200 configured to operate the valve 75 using an air actuator 70 designed to withstand the high pressure stored in the pressure cylinder 220. In this application example, if the actuator 70 is designed to handle the high pressure in the pressure cylinder 220, the pressure accumulator 400 is unnecessary. The air actuator 70 designed to use the maximum pressure of the pressure cylinder 220 has the advantage of being smaller and lighter than the standard air actuator 70. The components of one embodiment of the present invention may be made of any material that is durable to the operating environment to which the emergency air supply system 200 is exposed.

  Although the present invention has been shown and described in considerable detail with respect to only a few exemplary embodiments thereof, particularly in light of the foregoing teachings, without substantially departing from the novel teachings and advantages of the present invention. It should be understood by those skilled in the art that various modifications, omissions, and additions may be made to the disclosed embodiments and that the present invention is not intended to be limited to these embodiments. It is. Accordingly, all such modifications, omissions, additions and equivalents are intended to be included as included within the spirit and scope of the invention as defined by the appended claims. For example, but not limited to, embodiments of the present invention may include different electrical, electrical, or pneumatic actuator designs, or nuclear plant components that are not within a containment area.

DESCRIPTION OF SYMBOLS 10 Nuclear power plant 15 Pressure tank 20 Air compressor 25 Pressure regulator 30 Valve 35 Check valve 40 Orifice 45 Air piping 50 Check valve 55 Accumulator 60 Relief valve 65 Solenoid valve 70 Air actuator 75 Valve 130 Inside containment vessel 133 Containment vessel wall 135 Containment vessel outside 200 Emergency air supply system 205 Main body 210 Discharge port 215 Guide tube 220 Pressure vessel 222 Metal seal 223 Operation chamber 225 Solenoid 230 Core 235 Shaft 240 Penetrator 245 Spring 250 Cap 255 Cap seal 260 Distance “X "
300 control system 400 accumulator 410 accumulator mount 420 accumulator seal 430 outlet port 500 valve positioner 510 valve body

Claims (18)

An apparatus for supplying an air fluid to a system in a containment area of a nuclear power plant,
A body mechanism configured to receive an air fluid and route it toward components of the system located in the containment area of the nuclear power plant;
The body mechanism is
An exhaust port configured to cause the air fluid to flow out of the body mechanism;
A supply port with a seal configured to receive the air fluid from a source and configured to substantially prevent the air fluid from flowing toward the exhaust port;
A guide tube configured to position the instrument, whereby the instrument is slidably moved through a portion of the guide tube to engage the seal;
An operation chamber configured to direct the air fluid from the supply port to the exhaust port;
A drive device for moving the instrument,
The body mechanism and the drive are disposed within a containment area of a nuclear power plant and operate jointly as an air fluid source to at least one system of the nuclear power plant;
apparatus. The apparatus of claim 1, wherein a first portion of the operation chamber substantially abuts an interior area of the supply port and a second portion of the operation chamber substantially abuts an interior area of the guide tube. The instrument includes a core that punctures the seal, the core is operable in the guide tube, includes a shaft, the shaft includes a penetrator, and the penetrator can penetrate the seal. The device of claim 2, wherein the device is made of a simple material. The apparatus of claim 3, wherein the penetrator is removable from the shaft. The apparatus of claim 1, further comprising a plurality of exhaust ports. The apparatus of claim 1, wherein the source comprises a pressure vessel. The apparatus of claim 6, wherein the pressure vessel comprises a pressure cylinder. The apparatus of claim 6, wherein the pressure vessel comprises a plurality of pressure cylinders. The apparatus of claim 1, wherein the drive comprises a solenoid coil. The apparatus of claim 1, further comprising a control system for operating the drive. An emergency fluid supply system operable within a containment area of a nuclear power plant,
A nuclear power plant with a containment area in which the boiling water reactor is operated;
A system comprising an air actuated valve for receiving an air supply from a primary fluid source;
An emergency air supply system configured to provide additional air supply when needed, and
The emergency fluid system is disposed within the containment area, and the emergency fluid system comprises:
A body mechanism configured to receive an air fluid and route it toward components of the system located within the containment area of the nuclear power plant;
The body mechanism is
An exhaust port configured to cause the air fluid to flow out of the body mechanism;
A supply port with a seal configured to receive the air fluid from a source and configured to substantially prevent the air fluid from flowing toward the exhaust port;
A guide tube configured to position the instrument, wherein the instrument is slidably moved through a portion of the guide tube to engage the seal;
An operation chamber configured to direct the air fluid from the supply port to the exhaust port;
A drive device for moving the instrument,
system. The system of claim 11, wherein one side of the operation chamber substantially abuts the interior of the supply port and the other side of the operation chamber abuts the interior of the guide tube. The instrument includes a core that pierces the seal, the core is operable in the guide tube, includes a shaft, the shaft includes a removable penetrator, and the penetrator penetrates the seal. 12. The system of claim 11, wherein the system is formed of a material capable of. The system of claim 11, further comprising a plurality of exhaust ports. The system of claim 11, wherein the source comprises a pressure vessel. The system of claim 15, wherein the pressure vessel comprises a pressure cylinder. The system of claim 11, wherein the drive comprises a device having at least one nuclear power class solenoid. The system of claim 11, further comprising a control system for controlling operation of the emergency air supply system.

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